LM3501TL-16EV National Semiconductor, LM3501TL-16EV Datasheet
LM3501TL-16EV
Specifications of LM3501TL-16EV
Related parts for LM3501TL-16EV
LM3501TL-16EV Summary of contents
Page 1
... LEDs. Typical Application Circuit © 2005 National Semiconductor Corporation Features n Synchronous rectification, high efficiency and no external schottky diode required n Uses small surface mount components ...
Page 2
... Connection Diagram Ordering Information Order Number Package Type LM3501TL-16 micro SMD LM3501TLX-16 micro SMD LM3501TL-21 micro SMD LM3501TLX-21 micro SMD Pin Description/Functions Pin Name A1 AGND OUT GND CNTRL A2 SHDN AGND (pin A1): Analog ground pin. The analog ground pin should tie directly to the GND pin. ...
Page 3
... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications (LM3501-16)(Note 2) OUT V (LM3501-21)(Note 2) OUT V (Note Voltage SHDN Voltage CNTRL Maximum Junction Temperature Lead Temperature (Soldering 10 sec.) Vapor Phase (60 sec.) Infrared (15 sec ...
Page 4
Electrical Characteristics Specifications in standard type face are for T Range −10˚C to +85˚C. Unless otherwise specified V A LM3501-21. Symbol Parameter I SHDN Pin Current (Note CNTRL Pin Current (Note 9) CNTRL I ...
Page 5
Electrical Characteristics Specifications in standard type face are for T Range (T = −40˚C to +125˚C). Unless otherwise specified V J LM3501-21. Symbol Parameter R NMOS Switch R DSON DSON PMOS Switch R DSON D Duty Cycle Limit Limit (LM3501-16) ...
Page 6
Typical Performance Characteristics Switching Quiescent Current vs LED Efficiency vs. Load Current L = Coilcraft DT1608C-223, Efficiency = 100*(P /( LED Efficiency vs. Load Current L = Coilcraft DT1608C-223, Efficiency = 100*(P /(4V IN www.national.com Non-Switching ...
Page 7
Typical Performance Characteristics Output Power vs. Temperature (LM3501-16 Coilcraft DT1608C-223) SHDN Pin Current vs. SHDN Pin Voltage FB Voltage vs. CNTRL Voltage (Continued) FB Pin Current vs. Temperature 20065387 CNTRL Pin Current vs. CNTRL Pin Voltage 20065377 Switch ...
Page 8
Typical Performance Characteristics Switch Current Limit vs. Temperature (LM3501-16, V OUT Switch Current Limit vs. V (LM3501-21) Switch Current Limit vs. Temperature (LM3501-21, V OUT www.national.com (Continued) Switch Current Limit vs. Temperature = 8V) 20065363 Switch Current Limit vs. Temperature ...
Page 9
Typical Performance Characteristics Oscillator Frequency vs Voltage vs. Temperature FB Voltage vs. V (Continued) IN 20065364 20065380 IN 20065381 Bias vs. V Voltage OUT OUT (LM3501-16) 20065365 FB Voltage vs. Temperature 20065382 NMOS R vs. ...
Page 10
Typical Performance Characteristics PMOS R vs. Temperature DSON Start-Up (LM3501-16) 3 LEDs 22Ω 3.0V, CNTRL = 2.7V LED IN 1) SHDN, 1 V/div 100 mA/div mA/div, ...
Page 11
Typical Performance Characteristics Typical V Ripple, OVP Functioning (LM3501-16) OUT V open circuit and equals approximately 15V DC, V OUT 200 mV/div, AC OUT ms/div (Continued) Typical V OUT 20065383 = 3.0V V open ...
Page 12
Operation The LM3501 utilizes a synchronous Current Mode PWM control scheme to regulate the feedback voltage over almost all load conditions. The DC/DC controller acts as a controlled current source ideal for white LED applications. The LM3501 is internally compensated ...
Page 13
Application Information ADJUSTING LED CURRENT The maximum White LED current is set using the following equation: The LED current can be controlled using an external DC voltage. The recommended operating range for the voltage on the CNTRL pin is 0V ...
Page 14
Application Information The minimum inductor value required for the LM3501-16 can be calculated using the following equation: The minimum inductor value required for the LM3501-21 can be calculated using the following equation: For both equations above µH, ...
Page 15
Application Information to minimize copper trace connections that can inject noise into the system. The ground connection for the current set- ting resistor should connect directly to the GND pin. The AGND pin should connect directly to the GND pin. ...
Page 16
Application Information www.national.com (Continued) FIGURE 5. 2 White LED Application FIGURE 6. Multiple 2 LED String Application 16 20065309 20065366 ...
Page 17
Application Information (Continued) FIGURE 7. Multiple 3 LED String Application FIGURE 8. LM3501-21 5 LED Application 17 20065367 20065369 www.national.com ...
Page 18
... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...